The Logan River is a river in South East Queensland. The catchment is dominated by urban and agricultural land use. Near the river mouth are mangrove forests and a number of aquaculture farms. The Logan was discovered in August 1826 by Captain Patrick Logan. Logan initially named the river the Darling River, but to avoid confusion, Governor Ralph Darling ordered the name be changed to honour its discoverer.
The river begins in the Mount Barney National Park, near the New South Wales border between Mount Lindesay and Mount Ernest, before heading north, east and eventually flowing into Moreton Bay. The Mount Lindesay Highway crosses the river via Maclean's Bridge.Its principal tributaries are the Albert River which joins it just east of Beenleigh, Teviot Brook which begins at Mount Superbus and joins the Logan River at Cedar Pocket and Burnett Creek which is subverted by the Maroon Dam west of Rathdowney.
(n) imformation taken from Wikipedia
The Albert River
The Albert River is a river in South East Queensland. Its catchment lies within the Gold Coast and Beaudesert shires and covers an area of 782 square kilometres. The river provides drinking water for the town of Beaudesert. The river was named by Robert Dixon. It was named after Prince Albert of Saxe-Coburg and Gotha.
The river has two main tributaries which begin in the Lamington National Park. Downstream the river joins the Logan River 12 km from its mouth at Eagleby before entering Moreton Bay. The Albert River is a sub-catchment of Logan River. The other major tributary of Logan River is Teviot Brook. The river is bounded by the McPherson Range to the south, the Beechmont Range in the east and the Jinbroken Range and Birnam Range to the west. Tributaries of the Albert River include the Albert River Left Branch, Albert River Right Branch, Canungra Creek, Cainbable Creek and Bidaddaba Creek.
(n) imformation taken from Wikipedia
The Wyaralong Dam is a mass concrete gravity dam with an un-gated spillway across the Teviot Brook that is located in the South East region of Queensland, Australia. The main purpose of the dam is for supply of potable water for the Scenic Rim region. The impounded reservoir is also called Wyaralong Dam. The dam was initiated by the Queensland Government in 2006 as a result of a prolonged drought which saw the catchment areas of South East Queensland's dams receive record low rain. Wyaralong Dam is located north-west of Beaudesert on the Teviot Brook, nestled at the base of Mt Joyce.
The Wyaralong Dam was completed prior to the 2010–2011 Queensland floods. On January 11, during the flood period, the Mayors of both Logan City and Scenic Rim said they believed that Logan had been spared a great deal of flood damage because of the dam.
The concrete dam structure is 48 metres high and 490 metres long. The dam wall is constructed from a medium cementitious mix roller compacted concrete. The foundation is a sub horizontal dipping blocky sandstone. The dam is built with a 130-metre wide uncontrolled central primary spillway and an uncontrolled left bank secondary spillway which commences discharging at the 1:100 year flood level. The dam cross section is rather squat in order to provide sufficient resistance against potential sliding along foundation bedding planes. The 218,300-thousand-cubic-metre dam wall holds back the 103,000-megalitre reservoir when at full capacity. From a catchment area of 546 square kilometres that includes much of the western portion of the McPherson Range, the dam creates an unnamed reservoir with a surface area of 1,230 hectares (3,000 acres). Teviot Brook and the surrounding land is a recognised Aboriginal Pathway with significant cultural heritage values.
The dam is managed by SEQ Water as part of a water security project in the South East Queensland region, known as the South East Queensland Water Grid. The outlet is on the right bank and is capable of abstracting water from any level of the reservoir by the use of baulks. The outlet includes an innovative and operationally complex bidirectional fish lift, which uses a single hopper to transport fish in both upstream and downstream directions.